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nitrhtatrs @anni @frn ROBERT HUNTER, OF NEW-YOBK,AN. Y.

Letters Patent No. 80,960, dated August 11., 1868.

IMPROVEMENT VIN PROPELLBRS.

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Beit known that I, ROBERT HUNTER, of No. 9 Brevoort Place, in the city of New York, doctor of -medicine, have invented an Improved Propeller for steam-vessels, canabboats, and other vessels; and I hereby declare that the following is a true and exact description thereof, reference boing made tothe accompanying drawings.

Figure l represents one form of the propeller.

It may be made either square, oblong, round, or octagonal.

a b c o3 represent four sides of a frame or chamber, within which may be arranged two or more oats.

, The best form and 'construction oi' these iloats are seen in Figure 2. il Y- In Figure 3 the axes b b1 b2 b3 b4, vibrate in journals cl ef, for one-quarter of a circle, and are so arranged that the lower edge ofv each iloat shall rest over the axle immediately below it.

The object of this arrangement is to give the oats as much support as possible while impinging against the water. s

Figure 4 represents a different arrangement of the oats in `the propeller.

The oats a and 6 are hung on vertical axes, cl c2, (or one vertical 'axle may be commento both,) so as to operate horizontally. These floats must be made of' suicient length to rest on or ,against the sides of the frame e andf. The surface of these iioats may be made straightor slightly curved. I prefer the latter form, as giving a rmer hold on the Water, as shown in g. 2.

Either of the above-described forms of the propeller must be rigidly attached to the lower extremity of a vertical lever, g, figs. 1 and 3, which swings or oscillates on the axis 7L, Figure 5, or the lever maybe attached to anaxis which partially revolves`in its journals, orthe Aaxis inay be enlarged in the centre to permit the lever to pass through it, and move with the lever z, as show-n in iig. 5. f i

When the lever g, iig. 5, is operated by a horizontal engine, A, iig.v5, attached to its lupper extremity, K, the lower end,A armed with the before-described propeller, will oscillate between the `pointsp and l.

Figure 6 represents a different description of the frame, and may be made of any desirable shape. o

a1 a? as is a frame of round iron. c c is the axle of one'of` the oats,.placed one-third the width of the float from the centre. The axle-is immovably xed to thelframe, and the iloatvibrates around it. The axle may be 'placed at a less distance than one-third the width of the float from the centre of the frame, or at any distance greater than one-third, less than one-half. The frame may alsobe diminished in size, so as to cause the oats Vto overhang to a greater extent. Either of these frames may he made of any desirable shape, and used with asingle oat hung or irmly secured to a horizontal or vertical axis by oneedge, or at any point which is less than half the dista-nce from the centre of the float. In boats of small tonnage, the single float will be found the cheapest, and equally'as eiicient as two or more iioats. I

The object sought to be obtained by this invention is a propeller, which feathers by self-action, when moved in the line of the vcssels motion, and closes by self-action when moved in the opposite direction, whereby the least and greatest possible resistance from or against the water is respectively obtained. Having thus described my invention, what I' claim as new, and desire to secure by Letters Patent, is as follows: The oscillating-lever g, adapted to be turned upon its axis for reversing, in combination with a pivot-float propeller,` substantially as and for the purposes'stated. A

New York, June 27, 1868.

ROBERT HUNTER.

Witnesses K. BARTON, R. O. HUNTER. 

